Root +layout.server.ts load function is called twice with Chrome dev console open

[IcyFoxe]

Describe the bug

I've noticed that my fetch calls in +layout.server.ts load function are being called twice when the Chrome dev tools tab is open and page is refreshed. If it's closed, load function is being called only once.

This happens only if you have a root [...rest] route. Doesn't matter if it's +page.server.ts or +page.svelte.

When logging event.request.headers.get("sec-fetch-dest") in hooks.server.ts handle function, first log returns "document" and second one returns "empty".

Reproduction

https://github.com/IcyFoxe/sveltekit-double-load-call

System Info

System:
    OS: Windows 10 10.0.19044
    CPU: (12) x64 AMD Ryzen 5 5600X 6-Core Processor
    Memory: 10.07 GB / 31.90 GB
  Binaries:
    Node: 24.4.0 - C:\Program Files\nodejs\node.EXE
    npm: 11.3.0 - C:\Program Files\nodejs\npm.CMD
  Browsers:
    Chrome: 142.0.7444.59
    Edge: Chromium (130.0.2849.80)
    Firefox: 144.0.2 - C:\Program Files\Mozilla Firefox\firefox.exe
    Internet Explorer: 11.0.19041.5794
  npmPackages:
    @sveltejs/adapter-node: ^5.4.0 => 5.4.0
    @sveltejs/kit: ^2.47.1 => 2.48.4
    @sveltejs/vite-plugin-svelte: ^6.2.1 => 6.2.1
    svelte: ^5.41.0 => 5.43.3
    vite: ^7.1.10 => 7.1.12

Severity

annoyance

Additional Information

No response